That's incorrect - the Commons chamber can comfortably seat about 600, the number of MP's is 650. After WWII the Commons chamber was reconstructed (including the Speaker's chair) as a sign of continuity. The reason for the space allocation in the 19th Century was to make a full sitting uncomfortable, not to discourage attendance but because the Commons are not supposed to be comfortable, that's what they have padded benches, and not desks with microphones as in the US or Australia.
I'd like you to explain these "pairing" arrangement, because I've never heard of them - if you're talking about the shape of the chamber, it's based on the Chapel parliament used to sit in. If you're talking about the arrangement of having a Loyal Opposition and a shadow cabinet, I don't feel I need to defend the practice.
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